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a/README.md b/README.md new file mode 100644 index 0000000000000000000000000000000000000000..10e79d73d439d0ff2ceb63a75dcc6634aceb799f --- /dev/null +++ b/README.md @@ -0,0 +1,231 @@ +# tiered-mem-traces + +**60 memory access traces** for tiered-memory simulation, covering all 16 +benchmark suites of the [CMU-SAFARI/DAMOV](https://github.com/CMU-SAFARI/DAMOV) +suite, plus **1 LLM-inference trace** collected from llama2.c (under +`llama_inference/`, Git LFS — see § LLM-inference trace). +Each trace preserves load/store/modify classification from +[Valgrind's lackey tool](https://valgrind.org/docs/manual/lk-manual.html). + +## Format + +Each trace is a gzipped text file with one memory operation per line: + +``` +S 1fff000198,8 +S 1fff000190,8 +S 1fff000188,8 +L 04038e06,1 +M 04038e10,4 +``` + +- `L` = load, `S` = store, `M` = modify (read-modify-write) +- `,` = byte address and access size +- Instruction fetches are excluded; only data accesses are recorded + +Total: 97 MB compressed (~4 GB uncompressed). + +## Traces (60 total, by suite) + +| Trace | Description | Access Pattern | Size | +|-------|-------------|----------------|-----:| +| **bwa** (genomics) | | | | +| `bwa.AlignLite` | BWA-MEM short-read alignment via FM-index lookup | scattered reads into a hot index region | 817K | +| **chai** (heterogeneous) | | | | +| `chai.BFS` | frontier-driven graph BFS over a CSR graph | scattered adjacency reads, drifting hot frontier | 1.1M | +| `chai.BS.BEZIER_KERNEL` | 2D Bezier surface evaluation | structured streaming with small reused control set | 1.1M | +| `chai.CEDD.Gaussian` | 5x5 Gaussian-blur image convolution | stencil streaming, near-perfect spatial locality | 1.3M | +| `chai.CEDD.Sobel` | 3x3 Sobel edge-detection | stencil streaming | 1.3M | +| `chai.HSTI` | input-side histogram increment | stream-read + scattered hot-write into bins | 782K | +| `chai.OOPPAD.OOPPAD` | out-of-place 2D padding (border insertion) | streaming with reflected-border copy | 1.3M | +| `chai.SC.SC` | stream compaction = filter + prefix-sum + scatter | two streaming passes + scattered scatter | 753K | +| **darknet** (ML) | | | | +| `darknet.conv` | im2col-style 2D convolution layer | weight streaming + activation reuse | 1.1M | +| **gase** (genomics) | | | | +| `gase.Align` | banded Smith-Waterman DP cell update | streaming along the band, three-row reuse | 4.1M | +| **hardware_effects** (microbench) | | | | +| `hardware_effects.bandwidth` | page-stride memory walk | scattered, anti-prefetcher pattern | 2.5M | +| `hardware_effects.false_sharing` | single-threaded RMW alternating two cache-line slots | high temporal locality, RMW writes | 259K | +| **hashjoin** (database) | | | | +| `hashjoin.MPSM` | massively-parallel sort-merge join | two-stream merge with run-length copies | 2.8M | +| `hashjoin.NPO.HashJoin` | no-partition open-addressed hash join (build + probe) | sequential probe + hot hash-table writes | 1.1M | +| `hashjoin.NPO_st` | single-thread no-partition variant of NPO | sequential probe + scattered hash-table reads | 2.8M | +| `hashjoin.PRO` | partitioned radix-style hash join | phase change between partition-build and probe | 1.5M | +| **hpcc** (HPC) | | | | +| `hpcc.RandomAccess` | GUPS-style xor-shift updates to random table slots | uniform-random scattered RMW | 2.5M | +| **hpcg** (HPC) | | | | +| `hpcg.CG` | conjugate-gradient inner loop on a 7-pt sparse stencil | SpMV scattered reads + vector streaming reductions | 2.2M | +| `hpcg.MG` | 3-level multigrid V-cycle (smooth + restrict + prolong) | stencil sweep at multiple resolutions | 408K | +| `hpcg.SpMV` | sparse matrix-vector multiply on a 27-pt stencil | row-streaming + scattered neighbor reads | 1.2M | +| **ligra** (graph) | | | | +| `ligra.BC` | betweenness centrality via Brandes-style two-pass BFS | frontier sweep + dependency back-propagation | 2.7M | +| `ligra.BellmanFord` | single-source shortest paths via repeated edge relaxation | edge-stream sweep with dist updates per round | 3.1M | +| `ligra.BFS` | frontier-driven BFS | per-level frontier sweep, drifting hot set | 1.9M | +| `ligra.Components` | connected-components via min-label propagation | full edge-stream sweep per round, label updates | 2.4M | +| `ligra.KCore` | k-core decomposition by iterative low-degree peeling | vertex-array sweep with neighbor degree updates | 2.0M | +| `ligra.MIS` | maximal independent set via Luby-style randomized priority | neighbor-priority compare + alive removal | 1.9M | +| `ligra.PageRank` | PageRank: full-vertex sweep with adjacency-list reads | per-iter full-vertex stream + scattered neighbor writes | 2.0M | +| `ligra.Triangle` | triangle counting via per-edge neighbor-set intersection | nested adjacency-list scans, heavy reads | 520K | +| **parboil** (HPC) | | | | +| `parboil.histo` | image histogram with ~16k bins | streaming read + scattered bin RMW | 884K | +| `parboil.mri-q` | MRI Q-matrix construction (per-voxel trig accumulation) | double-loop over voxels x k-points, streaming | 1.5M | +| `parboil.sgemm` | naive single-precision dense matmul | triple-loop with strided B access | 1.1M | +| `parboil.spmv` | sparse matrix-vector multiply (random sparsity) | row-stream + irregular column reads | 815K | +| **parsec** (multimedia) | | | | +| `parsec.Streamcluster` | k-means-style center-distance scan | stream over points + sequential per-DIM | 1.1M | +| **phoenix** (mapreduce) | | | | +| `phoenix.histogram` | 256-bin histogram over a streaming byte input | streaming read + dense hot-write into 256 bins | 863K | +| `phoenix.kmeans` | k-means iterations: assign + center update | phase change between assign and reduce | 963K | +| `phoenix.lr` | linear-regression gradient descent | streaming over (x, y) pairs | 956K | +| `phoenix.matrix-mult` | MapReduce-flavored dense matmul | row-by-row mapper-style sweep | 1.4M | +| `phoenix.reverseindex` | build a doc->terms reverse index | scattered hash-style writes + linked-list traversals | 744K | +| `phoenix.WordCount` | MapReduce word count via open-addressed hash table | streaming over words + scattered hash probes | 823K | +| **polybench** (HPC) | | | | +| `polybench.3mm` | three sequential dense matmuls (E=AB; F=CD; G=EF) | tiled streaming with phase change between matmuls | 1.6M | +| `polybench.atax` | y = A^T * (A x) (transpose + matrix-vector twice) | two streaming sweeps over A with vector reads | 897K | +| `polybench.bicg` | biconjugate-gradient kernel: q=Ap; s=A^T r | single sweep over A with two simultaneous reductions | 854K | +| `polybench.doitgen` | 3D tensor reduction | structured streaming with reduction | 1.2M | +| `polybench.gemm` | naive dense matmul C = A * B + C | triple-loop with strided B access | 1.4M | +| `polybench.syr2k` | symmetric rank-2 update C = AB^T + BA^T + C | triple-loop with shared inner-K accumulation | 1.6M | +| **rodinia** (heterogeneous) | | | | +| `rodinia.bfs` | BFS on a regular 4-connected 2D grid | regular per-level frontier sweep | 1.7M | +| `rodinia.cfd` | Euler-equation flux update on an unstructured mesh | edge-stream with scatter to two endpoints | 3.9M | +| `rodinia.hotspot` | 2D thermal-stencil sweep with two-array swap | 5-pt stencil, two-array swap per iter | 1.4M | +| `rodinia.lavamd` | short-range MD pairwise force calc with cutoff | O(N^2) pairwise with cutoff rejection | 1.4M | +| `rodinia.lud` | right-looking LU decomposition without pivoting | triangular sweep with shrinking trailing block | 1.6M | +| `rodinia.srad` | speckle-reducing anisotropic-diffusion image filter | two-pass per-pixel stencil | 1.8M | +| **splash2** (HPC) | | | | +| `splash2.FFT` | 1D FFT (bit-reversal + butterfly stages) | bit-reversal scatter + log(N) butterfly passes | 2.2M | +| `splash2.FMM` | O(N^2) particle pairwise interactions | O(N^2) double-loop with sqrt per pair | 966K | +| `splash2.OCEAN` | 2D 5-pt stencil sweep with two interleaved grids | stencil streaming with three-grid update | 1.9M | +| `splash2.RADIOSITY` | hierarchical 2D iterative form-factor refinement | KxK gather kernel applied per cell | 1.3M | +| `splash2.RAYTRACE` | ray casting through a small scene of spheres | per-pixel scene scan, frequent shared-data reads | 895K | +| **stream** (microbench) | | | | +| `stream.Add` | c[i] = a[i] + b[i] | perfectly sequential streaming, no reuse | 3.5M | +| `stream.Copy` | c[i] = a[i] | perfectly sequential streaming, no reuse | 3.5M | +| `stream.Scale` | b[i] = scalar * c[i] | perfectly sequential streaming, no reuse | 3.5M | +| `stream.Triad` | a[i] = b[i] + scalar * c[i] | perfectly sequential streaming, no reuse | 3.5M | + +## LLM-inference trace + +One extra trace lives under `llama_inference/` and is stored via **Git LFS** +(the file is ~323 MB compressed). It is **not** part of the 60-trace DAMOV +set above — different workload class, different scale. + +| Trace | Description | Access pattern | Size | +|-------|-------------|----------------|-----:| +| `llama_inference/llama2c_stories15M_n3` | [karpathy/llama2.c](https://github.com/karpathy/llama2.c) inference, TinyStories-15M architecture (dim=288, hidden=768, 6 layers, vocab=32000), `n=3` forward passes (BOS prefill + 2 generated tokens, seed=42), random `N(0, 0.02)` weights — memory pattern is determined by tensor shapes and access order, not weight values, so it is structurally identical to a real TinyStories-15M checkpoint | continuous hot scratchpad (RunState) + linear weight-tensor sweeps + KV-cache growth per generated token | 323M | + +Collection scale: 144,868,169 data accesses, 15,709 unique 4 KiB pages +(61.4 MiB footprint), captured under +`valgrind --tool=lackey --trace-mem=yes` with instruction fetches filtered +out. Loads 85.8 %, stores 13.7 %, modifies 0.4 %. + +### Access pattern (annotated) + +![llama2c stories15M, n=3 annotated VA](docs/llama_inference/llama2c_stories15M_n3_annotated.png) + +The y-axis is the actual virtual address (stack at 131 GiB excluded — 3 +pages absorbing 13.9 % of all accesses). Region boundaries are ground +truth from `/proc/self/maps` plus an instrumented `run.c` that printed +every weight / RunState / KV pointer under valgrind. Three forward passes +are visible as three structurally identical segments (dotted vertical +guides at ~46 M / ~84 M / ~122 M accesses): + +- **64–66 MiB — HEAP / RunState scratchpad.** A continuous horizontal band + touched throughout every pass. Holds `x`, `xb`, `xb2`, `q`, `att`, + `logits` and other activation buffers. ~11 pages absorb ~50 % of the + full trace's traffic; even with stack excluded, ~63 pages cover 50 % of + the remaining accesses. +- **75–110 MiB — `wcls` / `token_embedding` classifier sweep.** The large + diagonal climbing once per pass is the final `logits = matmul(x, wcls)` + projection against the 32,000-entry vocabulary (`wcls` is shared with + `token_embedding_table`). A 36.6 MiB linear scan at the end of every + forward pass. +- **110–134 MiB — per-layer weight matmuls.** The "rainfall" pattern is + six layers' worth of `wq`, `wk`, `wv`, `wo`, `w1`, `w2`, `w3` sweeps. + Each cold weight page is touched once per forward pass. +- **133–137 MiB — KV cache.** `key_cache` + `value_cache` (3.4 MiB total). + Pass 1 is pure stores; passes 2 and 3 have growing reads as the + attention softmax iterates over an increasing number of KV slots. +- **131 GiB — stack (filtered in the figure).** 3 pages, 13.9 % of all + accesses; valgrind redirects the user stack to the top of its managed + address space. + +The combination of a tiny continuously-hot scratchpad and a large +once-per-pass cold-weight sweep is the canonical heavy-tailed access +pattern of LLM inference: cache-policy choice barely matters at small +cache sizes because the hot set fits in any cache and the cold weight +scan is unaffected by eviction order. + +### Reproducing + +The collection pipeline (random-weight `model.bin` generator, valgrind +lackey wrapper, analyzer, plotter) lives in the arcsim repo: +[`scripts/llama_traces/`](https://github.com/alcriceedu/arcsim/tree/main/scripts/llama_traces). +See `scripts/llama_traces/README.md` for the full repro recipe and +`scripts/llama_traces/REPORT_stories15M.md` for the original +characterization run. + +## How Traces Were Collected + +Each trace comes from a small self-contained C facsimile that reproduces the +kernel's memory access pattern at smaller-than-production scale. The pipeline: + +``` +DAMOV recipe -> C facsimile (gcc -O0) + -> valgrind --tool=lackey --trace-mem=yes + -> awk filter (L/S/M lines only) + -> gzip -6 + -> *.bytes.trace.gz +``` + +These are **pre-cache** traces (Valgrind sees every load/store including stack +traffic). Working sets are small (all 60 traces have U <= 3091 4-KiB pages). +The qualitative access pattern shape (skew, reuse-distance distribution, +hot-set drift, spatial locality class) is preserved from the original DAMOV +kernels, but absolute access counts differ from production-scale runs. + +13 long-running workloads were SIGKILL-capped at ~25 min wall time once the +trace had grown to 25-200M accesses. + +## Suite Coverage + +| Suite | DAMOV Functions | Traces Here | +|-------|----------------:|------------:| +| bwa | 2 | 1 | +| chai | 19 | 7 | +| darknet | 4 | 1 | +| gase | 2 | 1 | +| hardware_effects | 4 | 2 | +| hashjoin | 12 | 4 | +| hpcc | 2 | 1 | +| hpcg | 5 | 3 | +| ligra | 39 | 8 | +| parboil | 7 | 4 | +| parsec | 5 | 1 | +| phoenix | 5 | 6 | +| polybench | 8 | 6 | +| rodinia | 11 | 6 | +| splash2 | 14 | 5 | +| stream | 4 | 4 | +| **Total** | **143** | **60** | + +## Attribution + +These traces are derived from the **DAMOV** benchmark suite by Oliveira et al. +(CMU-SAFARI). The kernels were re-implemented at small scale as self-contained +C facsimiles; the intent and naming of each trace follows the original DAMOV +classification. + +> Geraldo F. Oliveira, Juan Gomez-Luna, Lois Orosa, Saugata Ghose, +> Nandita Vijaykumar, Ivan Fernandez, Mohammad Sadrosadati, Onur Mutlu. +> "DAMOV: A New Methodology and Benchmark Suite for Evaluating Data +> Movement Bottlenecks." IEEE Access, 2021. arXiv:2105.03725 +> +> https://github.com/CMU-SAFARI/DAMOV + +DAMOV aggregates kernels from BWA, Chai, Darknet, GASE, Hardware-Effects, +HPC-Challenge, HPCG, Hashjoin, Ligra, PARSEC, Parboil, PolyBench, Phoenix, +Rodinia, SPLASH-2, and STREAM -- each licensed and credited by its upstream +authors. diff --git a/bwa.AlignLite.bytes.trace.gz b/bwa.AlignLite.bytes.trace.gz new file mode 100644 index 0000000000000000000000000000000000000000..1cac2cc51ae0c1168088cd18059fc9d1c96a3663 --- /dev/null +++ b/bwa.AlignLite.bytes.trace.gz @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:3276c58b378b1c2ad753e824c0f54396e0adb50e975dc735cc564a83512fe803 +size 836309 diff --git a/chai.BFS.bytes.trace.gz b/chai.BFS.bytes.trace.gz new file mode 100644 index 0000000000000000000000000000000000000000..5f84a654e1873614f542f21d2b1d735939dee5d0 --- /dev/null +++ b/chai.BFS.bytes.trace.gz @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid 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